Clasping hands and laughing together, the 53-year-old actor helped his gorgeous girlfriend, 38, shop for the perfect arrangement of radiant orchids at a local nursery. Both Theron and Penn looked casual and carefree during their outing — the blonde Oscar winner wore a pair of dark skinny jeans tucked into boots with a gray v-neck sweater, while the Gangster Squad actor opted for a dark henley and green utility jacket over denim.

Like a gentleman, Penn helped carry Charlize's orchid plant to the car, and then opened the door for the South African star. The actor's famous ex-wife Madonna, meanwhile, performed at the Grammys Sunday evening in L.A.

Theron and Penn's latest outing comes four days after the couple was photographed at a Whole Foods in L.A. with the Young Adult star's 2-year-old son, Jackson. It was confirmed last week that the two megastars were dating after journalist Piers Morgan wrote a blog post recalling his personal encounter with the two at Penn's Help Haiti Home gala on Jan. 11.

During the gala, the actor gave a touching shout-out to the actress, who inspired him to get rid of his gun collection: "I'm a self-proclaimed Alpha male who owns 67 firearms," Penn told the crowd as recalled by the Piers Morgan Tonight host for The Daily Mail's Event magazine. "But I've had my mind changed about guns by a strong woman," Penn confessed. "A beautiful South African woman."